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Peau tannée au chrome (le chrome donne une couleur bleue)
Wet-blue (tannage)
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Peau tannée au chrome (le chrome donne une couleur bleue)
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Hyperbranched polyurethanes with flammability resistance for leather retanning / Sheng Ding in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 10 (10/2022)
[article]
Titre : Hyperbranched polyurethanes with flammability resistance for leather retanning Type de document : texte imprimé Auteurs : Sheng Ding, Auteur ; Yiban Wu, Auteur ; Zhu Jinxing, Auteur ; Saiqi Tian, Auteur Année de publication : 2022 Article en page(s) : p. 441-447 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Calorimétrie
Caractérisation
Cuirs et peaux -- Propriétés mécaniques
Essais (technologie)
Inflammabilité
Mesure
Polymères -- Synthèse
Polymères ignifuges
Polymères ramifiés
Polyuréthanes
Retannage
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In this study, diethyl bis(2-hydroxyethyl) aminomethyl phosphonate was modified by hexamethylene diisocyanate, and then was utilized to partly replace the isocyanates to prepare hyperbranched polyurethanes (HPU-DPAs). The hyperbranched polyurethanes were then employed in the retanning process of wet blue. The shrinkage temperature, average thickness as well as mechanical properties of leather before and after retanning were acquired. The flammability of retanned leather was measured by cone calorimeter test. The morphologies of wet blue and leather after retanning by HPU-DAP were obtained using a scanning electron microscope. Results showed that the average thickness, tensile strength and elongation at break of leather were all improved after retanning. Retanning by HPU-DAPs can effectively increase flame retardancy of final leather. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of hyperbranched polyurethand retanning agent (HPU) - Synthesis of hyperbranched polyurethane with flammability (HPU-DAP) - Retanning technology - Measurements
- RESULTS AND DISCUSSION : Structure characterization - Application of FWPRA in retanning process - Flammability of retanned leather
- Table 1 : Retanning process
- Table 2 : GPC data, hydroxyl value as well as particle size of HPU and HPU-DPAs
- Table 3 : Ts, average thickness and mechanical properties of leather
- Table 4 : Main parameters from cone calorimeter test and vertical burning testDOI : https://doi.org/10.34314/jalca.v117i10.6184 En ligne : https://drive.google.com/file/d/1O_C0E7Ge3HR5Vt5IaW1eJee-K5ioerbX/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38230
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVII, N° 10 (10/2022) . - p. 441-447[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23652 - Périodique Bibliothèque principale Documentaires Disponible Identification and characterization of potential biocide-resistant fungal strains from infested leathers - A systematic study / Kavitha Sundar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 2 (02/2020)
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Titre : Identification and characterization of potential biocide-resistant fungal strains from infested leathers - A systematic study Type de document : texte imprimé Auteurs : Kavitha Sundar, Auteur ; Yasmin Khambhaty, Auteur ; Chandra Babu Narasimhan Kannan, Auteur Année de publication : 2020 Article en page(s) : p. 39-48 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aspergillus
Caractérisation
Champignons microscopiques
Cuirs et peaux -- Conservation
Résistance aux antimicrobiens
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : This study is aimed at identification of biocide tolerant/resistant fungal strains afflicting the leather industry. Fungal infestation occurs sometimes despite biocide treatment during leather processing. This persistent growth can be due to the development of biocide resistance which can lead to health hazards and economic loss. As no study has so far been reported to either confirm this or to identify such fungal strains, a systematic approach has been made in this study to address these aspects. Fungal strains were collected from infested leathers from tanneries to identify biocide resistant fungal strains afflicting leather industry. Phenotypic characterization revealed Aspergillus as the most dominant with 58% occurrence. Ten isolates were subjected to 18s rRNA sequencing and four strains were identified as Aspergillus niger. An in-vitro susceptibility to four leather fungicides was assessed to identify the biocide tolerant strains. S-6 A. niger strain was found to be the most tolerant as evidenced by high MIC (7.81µg ml-1) against the most effective biocide, 2-(thiocyanomethylthio) benzothiazole. In-vivo studies on chrome-tanned leathers also confirmed this finding. SEM studies revealed considerable morphological changes in S-6 compared to wild strain providing further evidence that it may have developed biocide resistance. Note de contenu : - MATERIALS AND METHODS : Source of media and chemicals - Collection of fungal infected leather samples from tanneries - Isolation and maintenance of fungal cultures - Phenotypic characterization - Genotypic identification and phylogenetic analysis - In vitro susceptility of the fungal strans against selected biocides - Studies on the growth of resistant strains on biocide treated leather - Scanning electron microscopy (SEM) analysis
- RESULTS AND DISCUSSION : Phenotypic characterization - Genotypic characterization - In vitro susceptibility of the fungal strains against selected biocides - SEM analysis - Evaluation of growth of A. niger strains on biocide treated wet-blue leathersDOI : https://doi.org/10.34314/jalca.v115i2.1483 En ligne : https://drive.google.com/file/d/1OlDyUj9jtT8B0doew2qNKyYGrKhBm5KY/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33889
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Code-barres Cote Support Localisation Section Disponibilité 21627 - Périodique Bibliothèque principale Documentaires Disponible Improvement in tanning properties of natural leather through surface modification assisted by CO2 low-temperature plasma / Fangming Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 1 (01/2018)
[article]
Titre : Improvement in tanning properties of natural leather through surface modification assisted by CO2 low-temperature plasma Type de document : texte imprimé Auteurs : Fangming Liu, Auteur ; Yuanping Jiang, Auteur ; Wenlan Xu, Auteur ; Zhengjun Li, Auteur ; Li Lixin, Auteur Année de publication : 2018 Article en page(s) : p. 26-33 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chrome trivalent -- Absorption
Cuirs et peaux
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux -- Propriétés organoleptiques
Stabilité hydrothermale
Tannage au chrome
Technique des plasmas
Traîtements de surface
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Low temperature plasma (LTP) technology is a green, solvent-free, clean, efficient environment-friendly surface treatment technology. The pioneering works were carried out by applying LTP to surface modification of natural leather in order to improve the chrome tanning exhaustion rate. The effects of different treatment time on tanning exhaustion rate, micro-structure, chemical compositions, mechanical and organoleptic properties of leather were studied. The optimal CO2 plasma treatment time is about 10 min, at which the chrome tanning exhaustion rate increases from 78.49% to 91.82% compared with untreated leather. The SEM results show that some micro-pores, fissures, deep ravines and filamentous fibers can be observed due to the surface etching effect. From the XPS analysis, compared with the untreated leather, the O1s concentration and the O1s/C1s ratio of the 10min LTP modified leather both increase from 18.75% to 28.85% and from 0.258 to 0.479, respectively. The results show that appropriate LTP process can effectively improve the chrome tanning exhaustion rate, which reduces the emission of heavy metal chromium in waste liquor and also has a good synergistic effect on improving the comprehensive performance of leather such as hydrothermal stability, physical-mechanical and organoleptic properties. The LTP modification technology may be a new potential method for cleaner high-exhaustion chrome tanning technology. Note de contenu : - EXPERIMENTAL : Materials - LTP treatment - Chrome tanning - Characterization and performance test - Mechanical properties test - Organoleptic properties test
- RESULTS AND DISCUSSION : The effect of LTP treatment on chrome tanning absorption rate and the hydrothermal stability of wet blue - Surface morphology observation of leather - XPS analysis - The mechanism of applying LTP technology to tanning process - Mechanical property - Organoleptic propertyEn ligne : https://drive.google.com/file/d/1EM7noWdiA1YqRbHNmjib-7EZiGTBA5kg/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29749
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 1 (01/2018) . - p. 26-33[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19487 - Périodique Bibliothèque principale Documentaires Disponible Improvement of leather flame retardancy through nano clay addition / Samaneh Sepehri in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 11 (11/2020)
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Titre : Improvement of leather flame retardancy through nano clay addition Type de document : texte imprimé Auteurs : Samaneh Sepehri, Auteur ; Mohammad Amani Tehran, Auteur ; Fatemeh Zeighami, Auteur Année de publication : 2020 Article en page(s) : p. 418-427 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Argile
Cuir
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux de bovins
Cuirs et peaux de chèvres
Essais dynamiques
Nanoparticules
Résistance à la traction
Stabilité thermique
Tannage
Thermogravimétrie
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leather is widely used in various industries including apparel, safety clothing, aircraft and automotive, due to its unique properties such as softness, air permeability, chemical resistance, high flexibility and reasonable mechanical resistance. Since leather products usually contain flammable organic compounds such as tanning, fatliquoring, dyeing and finishing materials, improvement of its flame retardancy is very important. A lot of flame retardants have been synthesized and applied to improve flame retardancy of leather. One of the best materials is nanoclay because it is easily available, environment-friendly and has a low cost. In this research, we propose a process that reduces the burning length of the leather and increases its thermal stability. For this purpose, clay nanoparticles by 1, 3, and 5 mass percent (relative to wet leather mass) were added to wet-blue bovine and goat leather under certain (temperature and time) conditions during the re-tanning process. The results of the TGA test on bovine leather samples showed that by increasing the amount of nanoclay, the thermal stability of samples was increased. SEM images prepared from the grain and cross-sections of bovine and goat leather samples showed that with a high percentage of nanoclay, particle agglomeration is partially visible. The results of the vertical flammability test also showed that the presence of clay nanoparticles reduced the burning length of leather samples. Tensile strength of bovine leather samples containing clay nanoparticles increased compared to the control sample. However, the tear strength of them did not differ significantly. Note de contenu : - EXPERIMENTS : Materials and equipment
- PROCEDURE : a) Washing - b) Neutralization - c) Retanning - d) Fixation - e) Nano clay addition - f) Dyeing and fatliquoring - g) Washing and drying
- RESULTS AND DISCUSSION : Thermal stability - Morphology - Tensile and tear strength - Flame retardancy properties
- Table 1 : Outline formulation of process
- Table 2 : Samples description
- Table 3 : Mechanical properties of leather samples
- Table 4 : Burning length of bovine leather
- Table 5 : Burning length of goat leatherDOI : https://doi.org/10.34314/jalca.v115i11.4181 En ligne : https://drive.google.com/file/d/1S2qwkHR7LATO84gxJoGFMvRp6wNHmAzz/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34849
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXV, N° 11 (11/2020) . - p. 418-427[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22419 - Périodique Bibliothèque principale Documentaires Disponible Increased chromium tanning efficiency with collagen hydrolysates / A. Aslan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 90, N° 5 (09-10/2006)
[article]
Titre : Increased chromium tanning efficiency with collagen hydrolysates Type de document : texte imprimé Auteurs : A. Aslan, Auteur ; G. Gulumser, Auteur ; Bugra Ocak, Auteur Année de publication : 2006 Article en page(s) : p. 201-204 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux de moutons
Extraction (chimie)
Hydrolysat de collagène
Prétannage
Tannage au chrome
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Collagen hydrolysates obtained from shavings of chrome tanned sheep skins were used in a pretanning process for sheepskins and the effect on the efficiency of chrome tanning was observed. Various physical tests and chemical analyses were applied to tanned sheepskins and the results were evaluated statistically. Wet-blue leathers pretanned with 5% protein by-product (collagen hydrolysates) showed increased chromium take-up and had better physical characteristics. Note de contenu : - EXPERIMENTAL PROCEDURE : Extraction of collagen hydrolysates - Determination of some chemical characteristics of collagen hydrolysates
- PROCESSING OF SKINS : Determination of physical and chemical characteristics of tanned leathers
- Table 1 : Amino acid contents of collagen hydrolysates
- Table 2 : Certain chemical characteristics of collagen hydrolysates
- Table 3 : Production recipe used on skins
- Table 4 : Physical and chemical test results
- Table 5 : Colour values of wet-blue leathers pretanned with collagen hydrolysatesEn ligne : https://drive.google.com/file/d/1hL_nkvmDqKqoYYPK-P2Ps5sbFi48z_DN/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39057
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 90, N° 5 (09-10/2006) . - p. 201-204[article]Influence of elastin degradation on the mechanical properties of leather / Michaela Schröpfer in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 9 (09/2014)
PermalinkInfluence of selected process parameters on the reproducibility of aniline dyeings. II. The influences of retanning and dyeing processes of aniline dyeings / Rolf Streicher in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXVII, N° 8 (08/1992)
PermalinkInhibitive effects of some low-toxicity mildew inhibitors on wet blue / Liu Yan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 89, N° 4 (07-08/2005)
PermalinkInsight into the correlations between fiber dispersion and physical properties of chrome tanned leather / Xiu He in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 1 (01/2020)
PermalinkInteraction of enzymes and hide/leather based on microwave use / Jiacheng Wu in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 4 (07-08/2018)
PermalinkInvestigation of tartaric acid-copper sulphate mixture as a light stabilizer in leather dyeing / N. H. El-Sayed in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 87, N° 4 (07-08/2003)
PermalinkInvestigation on reducing chromium quantity in chromium containing wastes from leather industry using oyster mushroom (pleurotus ostreatus) / Eser Eke Bayramoglu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 1 (01/2020)
PermalinkIsothiazolinone as a fungicide for leather and shoe lining / Changqing Zhao in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 90, N° 6 (11-12/2006)
PermalinkLa journée d'étude du Centre Technique du Cuir du 7 février 1974 / F. Van Tornout in TECHNICUIR, N° 4 (04/1974)
PermalinkKeratin-silica matrix - A new protein filler from chicken feathers for retanning / R. Karthikeyan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 2 (02/2011)
PermalinkLearning to recognize irregular feature on leather surfaces / Masood Aslam in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 5 (05/2021)
PermalinkLeather fatliquor from hide fleshings / M. A. Habib in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 5 (09-10/2014)
PermalinkLeather retanning performance of carboxylated collagen fibres containing adsorbed Cr(III) / Qiang Taotao in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 4 (07-08/2018)
PermalinkLeather shavings treatment - An enzymatic approach / A. Crispim in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 87, N° 5 (09-10/2003)
PermalinkManaging chrome in leather manufacture / Jürgen Christner in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 12 (12/2012)
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